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<?php |
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/* |
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* This file is part of Rivescript-php |
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* |
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* (c) Johnny Mast <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Axiom\Rivescript\Cortex\Triggers; |
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use Axiom\Rivescript\Cortex\Input; |
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use Axiom\Rivescript\Traits\Regex; |
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/** |
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* Arrays class |
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* |
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* The Alternation class determines if a provided trigger |
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* is an Alternation. |
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* |
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* PHP version 7.4 and higher. |
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* |
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* @category Core |
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* @package Cortext\Triggers |
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* @author Johnny Mast <[email protected]> |
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* @license https://opensource.org/licenses/MIT MIT |
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* @link https://github.com/axiom-labs/rivescript-php |
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* @since 0.4.0 |
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*/ |
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class Alternation extends Trigger |
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{ |
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use Regex; |
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/** |
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* The Regex pattern to find sets |
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* in the trigger. |
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* |
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* Note: This pattern ignores the set if a @ character |
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* is inside to make sure we don't confuse them with arrays. |
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* |
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* @var string |
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*/ |
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// protected string $pattern = "/(\((?!\@)(.+?=*)\))|(\[(?!\@)(.+?=*)\])/ui"; |
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protected string $pattern = "/(\(|\[)(?!\@)(.+?=*)(\)|\])/ui"; |
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/** |
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* Parse the trigger. |
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* |
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* @return bool|string |
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*/ |
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public function parse(string $trigger, Input $input): bool |
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{ |
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if ($this->matchesPattern($this->pattern, $trigger) === true) { |
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$triggerString = $trigger; |
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$matches = $this->getMatchesFromPattern($this->pattern, $triggerString); |
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$sets = []; |
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/** |
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* Replace every "set" in the trigger to their index number |
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* found in the string. |
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* |
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* Example: |
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* |
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* "I (am|love) a robot. I like (my|style)" |
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* |
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* Will be replaced with: |
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* |
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* "I {0} a robot. I like {1}" |
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*/ |
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foreach ($matches as $index => $match) { |
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$set = explode("|", $match[2]); |
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if (count($set) > 0) { |
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$triggerString = str_replace($match[0], "{{$index}}", $triggerString); |
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$sets [] = $set; |
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} |
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} |
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$combinations = $this->getCombinations(...$sets); |
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if (count($combinations) > 0) { |
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$sentences = []; |
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foreach ($combinations as $combination) { |
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$tmp = $triggerString; |
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foreach ($combination as $index => $string) { |
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$tmp = str_replace("{{$index}}", $string, $tmp); |
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} |
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$sentences [] = $tmp; |
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} |
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$result = array_filter($sentences, static function (string $sentence) use ($input) { |
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return (strtolower($sentence) === strtolower($input->source())); |
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}); |
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if (count($result) > 0) { |
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return $input->source(); |
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} |
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} |
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} |
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return false; |
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} |
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/** |
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* Create a set of possible combinations for given arrays. |
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* |
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* Note: This function is taken from stackoverflow.com |
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* first posted by Guilhermo Luna and later edited by user Amlette. |
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* |
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* @see https://stackoverflow.com/questions/8567082/how-to-generate-in-php-all-combinations-of-items-in-multiple-arrays/33259643#33259643 |
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* |
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* @param array ...$arrays A set of arrays to combine. |
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* |
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* @return array|array[] |
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* |
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*/ |
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private function getCombinations(array ...$arrays): array |
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{ |
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$result = [[]]; |
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foreach ($arrays as $property => $property_values) { |
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$tmp = []; |
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foreach ($result as $result_item) { |
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foreach ($property_values as $property_value) { |
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$tmp[] = array_merge($result_item, [$property => $property_value]); |
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} |
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} |
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$result = $tmp; |
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} |
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return $result; |
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} |
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} |
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johnnymast /
rivescript-php
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